This study confirmed the classic theory that a wide grip bench will activate the lower chest more while a close grip bench will hit the triceps harder. Utilize both grip widths in your training to maximize upper body development and bench press strength!
Reference: Lehman, G. J. (2005). The influence of grip width and forearm pronation/supination on upper-body myoelectric activity during the flat bench press. The Journal of Strength & Conditioning Research, 19(3), 587-591.